Speaker: Saptaswa Ghosh

Title: Classical black hole scattering from Worldline QFT in modified theories of gravity

Abstract:

In this talk, we will briefly describe a technique useful for the computation of gravitational observables, impulse and waveform in a black hole scattering event, namely “Worldline Quantum Field theory.” We then show how to apply this formalism for a theory beyond GR  involving additional scalar (bulk) degrees of freedom, namely the Scalar-Tensor theory and the higher curvature terms (e.g. dynamical Chern-Simons theory). We will show how the impulse and waveform get corrected due to the extra scalar degree of freedom up to 2 PM in the Scalar-Tensor theory.  Furthermore, we will point out several intricacies when the mass of the scalar field is non-vanishing. We also show how the eikonal phase gets corrected up to 3 PM for spinning two body scattering events in dCS gravity.